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In situ measurements of calcium isotopes by ion microprobe in carbonates and application to foraminifera

Rollion-Bard, Claire ; Vigier, Nathalie ; Spezzaferri, Silvia

In: Chemical Geology, 2007, vol. 244, no. 3-4, p. 679-690

An analytical procedure has been developed for the in situ measurement of calcium isotope composition of carbonates with a spatial resolution of 15–20 μm on a Caméca IMS 1270 ion microprobe. By using two Faraday cup detectors, the ⁴⁰Ca and ⁴⁴Ca can be measured simultaneously, improving the internal reproducibility. Instrumental mass fractionation (IMF) of calcium isotopes was...

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In situ measurements of Li isotopes in foraminifera

Vigier, Nathalie ; Rollion-Bard, Claire ; Spezzaferri, Silvia ; Brunet, Fabrice

In: Geochemistry Geophysics Geosystems, 2007, vol. 8, p. Q01003

In situ measurement of Li isotope ratios in foraminifera has been developed using a Cameca ims 1270 ion microprobe. In situ δ⁷Li analyses have been performed in biogenic calcite of planktonic foraminifera from various locations. Results show that for west Pacific mixed Globigerinoides and Globorotalia (22°S161°E), the isotopic variability between tests and within a...

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